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-   -   Shudder / vibe lasts about 1 second (https://vansairforce.net/community/showthread.php?t=107131)

Bart 11-29-2013 11:36 AM

Shudder / vibe lasts about 1 second
 
For the second time in 6 months I've had a short duration (less than a second) shudder/vibration seemly from the prop or engine. Nothing comes up (flatline) on the egt or cht strips. There is no RPM change. Both times we were straight and level. Both times was about 5-10 mins after takeoff. Total time on plane about 200. It won't replicate with changes in RPM. MP. Or fuel flow, altitude or AS. Any thoughts?

KleensRV6 11-29-2013 02:12 PM

Bart-

If you have a way to download your EMS to a data sheet capturing that time period you might get an indication of what is taking place.

Good Luck,

DaAV8R 11-29-2013 03:24 PM

Vibe
 
Sounds a lot like a plug problem. At what power setting does this happen?

Bart 11-29-2013 03:29 PM

I can download the data. I'll take a look at it later tonight. The power setting was roughly 23 inches and 2200 both times.

DanBaier 11-29-2013 04:24 PM

If you have EMS - do you capture oil pressure? Anything happening there?

Dan

RV10inOz 11-29-2013 04:30 PM

Bart,

Send me a copy of the engine monitor file. davidbrown 'at' advancedpilot.com

There are a couple of things I can think of that will cause this, and even some rare bizarre things.

Can you also tell me the following;
Stage of flight i.e. just after TOC ?
Plugs: Brand, when were they gapped last.
Mags: Are the Mags or EI's
Fuel: What type are you using
EMS data log time interval
If you can, pin point the exact time these events occur in the data.

I will see what I can see?. :)

Bart 11-29-2013 07:41 PM

Well it looks like I had record turned off. So no data to show. With that said there we no anomalies that I caught in the cross check. No change in RPM no change in CHT / EGT. I'm recording now. I hate to chalk it up to a fouled plug but not sure I have much else to go on.

BillL 11-29-2013 08:18 PM

It could be many things, getting the data would be good for beginning a diagnosis. Generally, a single plug would work or not work, but not typically a transient misfire, so that is (probably) why David asked for the situation to better narrow the possibilities.

Bart 11-29-2013 08:57 PM

Yep, I get that. I've got the EFIS set to record now. Seems weird to have two seconds of events spread out over 6 months but the shudder/vibe is enough to get your attention. The first time it happened I thought I had a bird go through the prop.

RV10inOz 11-30-2013 12:11 AM

Bart,

Data lacking, can you please answer my questions as accurately as possible. I may still have some suggestions for you, but I do not want to send you on a goose chase either.


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